Communications: radio wave antennas – Antennas – With radio cabinet
Patent
1986-01-03
1988-04-26
Sikes, William L.
Communications: radio wave antennas
Antennas
With radio cabinet
343829, 343841, 455 90, 455300, H01Q 124
Patent
active
047407948
ABSTRACT:
A metal shield is dimensioned to enclose a portion of a portable radio having an internal antenna and a first transmission line. A transmission line mounted in the shield is positioned to be adjacent to the first transmission line when the shield engages the radio and permits energy to be coupled between the resonator and the first transmission line. The first transmission line and the shield are dimensioned so that the electrical length of the first transmission line increases to 2L when the shield engages the radio, where L is the electrical length of the first transmission line when the shield does not engage the radio. This electrical length transformation by an integral multiple of one half wavelength helps to maintain the input impedance to the internal antenna.
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Gunther Robert A.
Phillips James P.
Motorola Inc.
Sikes William L.
Warren Charles L.
Wimer Michael C.
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